JPS58131004A - Manufacture of aggregate decorative veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 1. An object of the present invention is to provide an improved method for producing laminated decorative veneers. Specifically, the objective was to improve the dyeing method for veneers used in the production of laminated decorative veneers.

[Background Art] Known laminated decorative veneers are generally manufactured as follows.

In other words, the raw veneers are degreased, bleached, dyed, or treated with a combination of these treatments, and then the veneers are laminated and laminated together with an adhesive, and the veneers are shaped into a desired curvature. Using a mold plate with a mold surface, the pieces are pressed and bonded to form a so-called flitch, which is then sliced. In such cases, the quality of the laminated decorative veneer largely depends on the method of dyeing and bleaching the veneer and its effectiveness. Also, depending on the dyeing or bleaching process, the range of wood species that can be expressed in the laminated decorative veneer changes.

This invention was made in view of such circumstances.

1) One-time coloring with a coloring agent, as has been done in the past, is not effective in expressing the annual rings of natural wood.
It was difficult to express a continuous deep change in color tone between the softwood (or softwood) and springwood parts.

In these decorative veneers obtained by laminating and assembling raw veneers with an adhesive interposed, the veneer surface color after one-time coloring is visible near the adhesive layer corresponding to the annual ring boundary. It was difficult to express the long and wide summer wood part. In addition, the color tone inside the veneer corresponding to the spring wood area was uniform, and it was impossible to express the continuous change in color tone from the summer wood area to the spring wood area, which is the case with natural precious wood.

2) In addition, dyes or pigments are added to the adhesive to express the dark colored layers (stripes) that appear regularly or irregularly (with respect to the tree ring boundaries) that are seen in zelkova, teak patterns, etc. The method of expressing this by forming an adhesive layer by blending such materials gives an unnatural feel to the transition area between the dark color layer and the spring wood, and does not fully express the goodness of natural precious wood. I couldn't finish it. In addition, there are many disadvantages in terms of cycles, such as the need to replace the adhesive layer that expresses the annual ring boundary, which is not a dark-colored layer, with an adhesive during the process.

3) In order to eliminate the disadvantages of 1) and 2) above, the method involves drying the first coloring and then applying the second color, but the second coloring penetrates only into the surface layer of the veneer, so it is easy to use. It was difficult to create a change in color throughout the interior of the board. Furthermore, carrying out the coloring process twice has the disadvantage of increasing the number of steps, such as drying after the first coloring, then applying the second coloring, and further drying.

This invention was made in response to this situation.

[Disclosure of the Invention] This invention provides that in the veneer coloring process in the manufacturing process of laminated decorative veneers, after the first coloring, the veneer is colored with a different coloring liquid from the previous coloring liquid without drying the veneer. A second coloring process is carried out, after which it is dried, and then an adhesive is applied and the layers are laminated. It is characterized in that it applies pressure in the opposite directions to form a flitch by pressing and integrating, and then slices.

Alternatively, the raw material veneer may be bleached or degreased and then left as is, or after the first coloring described above, without drying, the coloring liquid can be applied to the surface of the veneer or to both the front and back surfaces of the veneer. Coloring is carried out to obtain the desired change in color tone by penetration into the veneer, and a decorative veneer is obtained by assembling in the same manner.

As a coloring agent, a dye-based coloring liquid is used depending on the color tone to be expressed. The first coloring process is to uniformly color the interior of the veneer, using a relatively low concentration (5%
It is preferable to use it as a staining solution (below).

When laminating, it is preferable to reduce the difference in tone and lightness between the surface color and the internal color of the colored raw material veneer for materials where the growth ring area of the natural wood, which is expressed as an adhesive, is less conspicuous. Better results can be obtained by doing this method.

On the other hand, for the second coloring, a dye-based coloring liquid is used, but the quotient concentration (10
~50%) is preferably used as a staining solution. In cases where the annual ring boundary is sharp, the sharp expression of the annual ring boundary can be achieved by laminating a twice-colored surface and a once-colored surface with an adhesive interposed.

The dye used in this invention is preferably an acidic dye in terms of ease of dyeing and disposal of waste liquid.

For the first coloring, the coloring solution is mixed using an appropriate commercially available acid dye, with a weight ratio of dye/water - 0.2 to 1.2/10.
The coloring conditions are preferably 95±2° C. for 1 to 6 hours. Moreover, the immersion method is preferable as the operation. Note that in order to uniformly color the inside of the veneer, it is preferable to apply at a low concentration and for a long time.

For the second coloring, the dye composition is dye/water = 5 to 3.
The basic composition is 0/100 (weight ratio), and when controlling the degree of penetration into the veneer, use 10 to 20 of polyethylene glycol (PEG) or 0.3 to 1 of sodium polyacrylate as a viscosity modifier. Add. This is 1
Is it possible to apply 70 to 100 g/n on the surface or both sides of a raw material QJ board that has been colored for the second time or only bleached or degreased without drying it? ), then dry with an infrared heater for about 3 minutes. The ambient temperature at that time is preferably about 120 to 130°C.

Next, explanation will be given based on an example.

Example 1 Rotary-cut Labra raw veneer was cut into pieces with a thickness of 1 mm, a width of 1 shaku, and a length of 8 shaku, washed in warm water at 95°C for 1 hour, and then dyed with a coloring solution at 95°C in a dyeing bath. (dye/water = 1.3/100 in weight ratio) for 4 hours, and a second coloring solution was applied without drying. The coloring liquid was mixed in a weight ratio of 54 parts dye, 100 parts water, and 3 parts sodium polyacrylate. Next, it was immediately dried with an infrared heater (120 to 130°C) for 3 minutes, and then dried with a steam dryer until the moisture content (bone dry basis) became 30 to 40%.

80 g/nf of colored adhesive was applied to the dyed veneer obtained above, and 250 pieces of once-colored veneer and twice-colored veneer were laminated as appropriate, and pressed with a concave-convex mold plate with a teak pattern engraved on it. Got a flitch. This flitch was sliced to obtain a laminated decorative veneer with a thickness of 0.6 mm.

Example 2 0-tally sliced Tepa raw veneer to a thickness of 0.8 m
It was cut to a size of m, diameter 1 shaku, and length 8 shaku. After decolorizing this, without drying, dye solution (dye 1.68, water 100
) was applied by spray and dried by heating with an infrared heater (120-130°C, 3 minutes), then 250 sheets coated with 80g/- of adhesive were laminated and pressed using a mold with a cherry pattern. Got a flitch. Next, this was sliced to obtain a laminated decorative veneer.

[Effects] As explained above, the present invention is characterized by including the step of applying a dyeing solution and drying the raw veneer without drying it after preparing the raw material veneer. As a result, it is possible to express tree species in which the colors of summer and spring wood change continuously, and to express tree species with clear catechisms.

Also, by adjusting the viscosity of the second colored liquid,
Furthermore, by adjusting the drying conditions (temperature, time, etc.) afterwards, it is possible to arbitrarily differentiate the color tone change in the thickness direction of the veneer, making it possible to express a single color layer, such as a teak pattern.

Claims (1)

[Claims] (1) The raw material veneers are degreased, bleached, dyed, or treated by a combination of these treatments, then laminated and laminated together with adhesive applied to create a desired curvature. A method for manufacturing decorative laminated veneers in which a so-called flitch is formed by pressure bonding using a mold plate having a mold surface, and then sliced. A method for producing laminated decorative veneer, which is characterized by including a process of drying after application.